Abstract

We describe the wavelength calibration method of a narrowband laser diode in continuous-wave (CW) cavity ringdown spectroscopy (CRDS). The method uses known spectral lines as wavelength markers to calibrate and refine the wavelength-current relation of laser diodes, and their spectral positions are taken directly from the HITRAN 2004 database. We built a compact CW CRDS apparatus with a 1.517μm (6594cm1) distributed feedback (DFB) laser diode as the light source and a 25cm long glass ceramic as the cavity in which to demonstrate the method. A wavelength precision of 0.8×103cm1 was obtained by comparing the HITRAN 2004 database, which was approximately four times more precise than that of the conventional method.

© 2009 Optical Society of America

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